Just do what the old NASCAR boys used to do. They would weld the K frame right to the car just to make everything nice and stiff. Here is a picture of a NASCAR chassis I took a few years ago. I think this chassis was from the 70's or maybe early 80's. It was still a torsion bar, leaf spring car so it was before the switch to trailing arms and coil springs.

Some of the parts are interesting to look at. The fabricated knuckle is very crude. Looks like a disc brake knuckle welded to a truck knuckle? The anti sway bar setup is fabricated, the strut bar is gigantic, the hubs are from an Imperial or a light truck or something along those lines.